毛竹林各器官对N素的吸收和利用率

doi:10.11707/j.1001-7488.20160508

Abstract

Abstract:

[Objective] Moso bamboo (Phyllostachys edulis) is an important ecological and economic bamboo species and it is critical to figure out how to increase its nitrogen (N) fertilizer use efficiency in the intensive management process. This study was conducted in an intensively-managed moso bamboo forest in Lin'an city, Zhejiang province, and aimed to explore the utilization and distribution of N fertilizer accurately, in order to provide a scientific support for precise fertilization and sustainable forest management. [Method] In this study, we set 6 sample plots with 20 m×20 m in size. These plots were fertilized or unfertilized, and each of them contained a quadrat with 5 m×5 m in size. By using ¹⁵N-urea and ¹⁵N tracer technique in the quadrat, we investigated the distribution in the bamboo and the N fertilizer use efficiency (NUE) derived from N fertilizer. [Result] The ¹⁵N distribution ratio (¹⁵NDR) and NUE were different between different ages of bamboos, with 1 a > 3 a > 5 a. One-year-old bamboo had significantly greater distribution ratio and NUE than the other two ages, whereas there was no significant difference in the distribution ratio and NUE between the latter ages. As for different organs, the culm, underground culm and leaf had higher ¹⁵NDR and NUE in one-year-old bamboo, while the underground culm and rhizome had higher ¹⁵NDR and NUE in 3- and 5-year-old bamboos. Meanwhile, the root, underground culm and leaf in one-year-old bamboo had higher ratio of ¹⁵N to total N, while the rhizome, root and underground culm in 3- and 5-year-old bamboos had higher ratio of ¹⁵N to total N. The NUE of the bamboo forest was lower, with only 13.96%±0.88%. [Conclusion] Young bamboo was able to absorb N from fertilizer more efficiently, while the underground organs had an increasing trend toward using fertilizer with increased age, suggesting that strengthening fertilization to young bamboo and underground organs could greatly promote fertilizer use efficiency. Moreover, moso bamboo forest had lower N fertilizer use efficiency, which deserves further researches in the future.

Key words: Phyllostachys edulis, ¹⁵N tracer technique, distribution, use efficiency

CLC Number:

S718.4

Mao Chao, Qi Lianghua, Liu Qirui, Song Xinzhang, Zhang Yu. The Distribution and Use Efficiency of Nitrogen in Phyllostachys edulis Forest[J]. Scientia Silvae Sinicae, 2016, 52(5): 64-70.

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The Distribution and Use Efficiency of Nitrogen in Phyllostachys edulis Forest

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